A strange alien world with three suns in its sky has just been discovered, but it didn't break any records. There are a handful of other known exoplanets with three host stars, and quite a few out there with two suns.

In a study published in the Astrophysical Journal (arXiv.org preprint), a team of astronomers at Cornell University has modeled the locations of the habitable zones for stars of spectral classes F to M and how long exoplanets can stay in them.

A crescent-shaped gap has been observed in the gas around a pair of stars. The astronomers who discovered it believe the missing material is coalescing into a planet, providing an unprecedented opportunity to understand how planet formation happens.

Caltech researchers have found evidence of a giant planet tracing a, highly elliptical orbit in the outer solar system. The object, nicknamed Planet Nine, has a mass about 10 times that of Earth and orbits about 20 times further out than Neptune

The solar system appears to have a new ninth planet. Today, two scientists announced evidence that a body nearly the size of NeptuneâEUR"but as yet unseenâEUR"orbits the sun every 15,000 years. During the solar systemâEUR(TM)s infancy 4.5 billion years ago,

Earth only has one parent star, but other planets exist in systems much different than our own. Binary star systems are more common than single stars, and though planets in triple star systems are more rare, they are not unheard of.